Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.006 Å R factor = 0.052 wR factor = 0.201 Data-to-parameter ratio = 15.2 For details of how these key indicators were automatically derived from the article, see

In the title compound, C8H3ClN4O5·C2H4O2, both the nitro groups are close to perpendicular [dihedral angles = 67.62 (15) and 86.73 (12)°] to the almost planar quinazoline unit [r.m.s. deviation = 0.014Å]. In the crystal, both the quinazoline and acetic acid mol­ecules form inversion dimers linked by pairs of N—H⋯O and O—H⋯O hydrogen bonds, respectively. R 2 2(8) loops arise in each case.